Singer HD0400S Instructions page 44

Additional lnformation About Rolled Hemming
Hold the thread chain when you begin sewing to
keep it from curling into the seam.
Place a slight tension on the material in the sewing
direction and a finer seam finish can be obtained.
The minimum overedge stitch width that can be
obtained for rolled hemming is approximately 1.
5mm (1/16 inch) since the cutting width cannot be
set below 3.5mm (9/64 inch).
To Secure the Rolled Hem Thread Chain
Apply a small drop of liquid seam sealant to the
end of the seam. Allow to dry, then cut the chain
close to the stitches.
Note: Test the liquid seam sealant for color
fastness before use.
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